Other
- Thoracic diaphragm, a thin sheet of muscle under the lungs
- Diaphragm (contraceptive), a small rubber dome placed in the vagina to wall off the cervix, thus preventing sperm from entering
- Diaphragm (mechanical device), a sheet of a semi-flexible material anchored at its periphery
- Diaphragm seal, a membrane that seals an enclosure
- Diaphragm pump, a type of pump
- Diaphragm arch, a type of arch
- Diaphragm wall, a type of wall
- Diaphragm valve, a type of valve
- Diaphragm (structural system), a structural engineering system used to resist lateral loads
- Diaphragm another name for a separator in electrochemical systems.
- Diaphragma a genus of algae.
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